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Problem: "TLS Negotiation failed, the certificate doesn't match the host." 1 Recommended Answer 502 Replies 1826 Upvotes
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I try to send an email from my email account which is connected as second to my gmail. It has worked 3 years. Now not. Just write me: TLS Negotiation failed, the certificate doesn't match the host.
I try to renew my login and password at the second account as gmail recommend, do not work. Does anyone know how to solve it? Thank you. Peter
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Same issue... I have reported the issue to GMAIL I think its probably an error on their side.
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same problem!
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same problem since yesterday...
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same problem here
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Same Problem...not able to send email using Gmail now.
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Mismo problema no puedo enviar desde mis cuentas asociadas a gmail
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same problem!
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This is a very recent issue with Gmail's SMTP in Outlook. I can only send emails by clicking


then it unblocks the login at Gmail and the email is sent as usual. What is very cumbersome is that it keeps asking the same thing time and time again, as it is not saving the login credentials and closes the connection, so I have to repeat the procedure every time.
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Same problem here. Can't send emails from my linked accounts.
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Same problem since today
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Same problem!
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same problem
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Same problem :(
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Same problem
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Same issue here, started yesterday in the morning and then worked fine all day and now I can't send anything this morning. I keep trying to edit the linked email address and it's saying my password is incorrect even though I just logged into the linked account on it's original platform....
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same problem
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I have the same problem as previously reported on my end. None of the suggested fixes here worked for me
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The same, over here...I need my mail for work, omg.
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same problem
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the same problem here....
TLS Negotiation failed, the certificate doesn't match the host.
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same problem. Out of the blue, hasn't happened before to me.
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mismo problema.. Alguna solución?
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I'm having same problem for the last week. sometimes the email goes through sometimes it bounces yesterday 8 or of 10 bounced, kept trying and sometimes on 3rd + attempt they went through.
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Same here... :(
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Same problem here.
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Ho appena risolto! Verificate le impostazioni SMTP del vostro provider / I just solved! Check your provider's SMTP settings

Per un account di dominio su Aruba, prima avevo smtp.nomedominio.ext / TLS / Porta 25

Ora le nuove impostazioni sono le seguenti:

Posta in uscita(SMTP): smtps.aruba.it
Nome account: indirizzo di posta (es.: nomecasella@nomedominio.ext)
Password: la password scelta al momento della creazione della casella
Usa SSL: Attiva
Autenticazione: Password
Porta Server: 465
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when you set up your outgoing Server SMTP, try changing the Port and using unsecured connection instead of SSL or TLS. With Network solutionsm, they seem to now require port 25 instead of port 587.
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Same here, for a week now. Why isn't the problem solved! I can't reach people!
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is 25 secure Mathew?
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Same problem here. The alias account is pointed to a Godaddy server
I do not recommend using port 25 or 587 are not secure.
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Same issue here, started yesterday in the morning
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Julio 587 should be secure
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Same problem...
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Same.  Had my alias e-mail x 7 years.
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SOLVED! 

I had to change my Gmail settings.

These are the steps I took:

- Settings > Accounts and Import 
- Find the account in question (e.g. myemail@example.com <-- substitute your email here)
- Click "edit info"
- Enter your name and choose your alias setting (or leave it as-is this step doesn't really matter)
- Click "Next Step"
MOST IMPORTANT: Change your SMTP Server setting
-- I previously had mine set to mail.example.com (where "example.com" was my custom domain). Your setting might be different, but what's important is what comes next. 
-- You'll need the domain of your host (dreamhost.com, hover.com, etc.)
-- Add "smtp." before the domain of your host
-- smtp.domainofyourhost.com (where "domainofyourhost.com" is the domain of the company that hosts your email).
- Port: 587
- Username: myemail@example.com (substitute your email here)
- Password: [the password your hosting company gives you for your email. It's probably different than your gmail password or from the password you use to log into your hosting company. If it's not different, it should be and you should go change your passwords now. ;) ]
- Click "Secured connection using TLS"
- Click Save Changes

That did the trick for me. I hope it works for you too.

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@Francisco Mosse  - could you post a screenshot or show path of how you fixed it please.
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I was just having this same issue, read Alex Peck's response, changed my port to 587 and it worked! Thank you, Alex! You're my hero!!
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@Alex Peck   This is what I had & it still says authentication failed.  Thank you for the detailed instructions though :)
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Me too - augh, this is critical for business. I've been banging my head for days now. 

Alex Peck - YOU ROCK!! Thank you and we use dreamhost as well !!

Whoop! 

Thanks again!!
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Me too! Gmail? Where you at here?!
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same issue
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The same problem
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Me too, not good!
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same fucking problem
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Same problem here: Can't forward emails either.
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Same problem here - probably on Gmail's end if so many are experiencing.
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@Alex Peck

Unfortunately for me (Godaddy) the solution didn't work ...
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Google WTF you do?
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Same problem
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Same problem here.
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What to hell is happening?

Aquí tenemos el mismo mensaje de error. Se indican unas instrucciones que no solucionan el problema.
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Same problem since this morning.  Google, get on this!
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The same prpblem since today. It was working until today correctly. What has changed?
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I've had the same problem for the last 2 days.
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It has to be something on Google's end. Super frustrating.

None of the fixes have worked for me either, including completely deleting and re setting up "Send mail as:" accounts.

I can send New emails from "Send as" accounts but cannot Reply to emails - they are all bouncing with "Message not delivered"
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Unfortunately didn't work for us at 100tb.com either
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It looks like google is not resolving the mx record of the domain anymore. 
So i had to correctly input the subdomain in the account settings and it started working again.

So before it was: mydomain.com
And now it is: mail.mydomain.com
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Esa opción de colocarle al Servidor SMTP: smtp.dominion.com no esta funcionando ya que godaddy coloca mail.dominio.com
Que se debe hacer llame a un godaddy y me indique que le problema no es de ellos
saludos
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Kudos to Alex Peck for posting the directions below.  It worked for me, but I had to exit and restarting my browser (Firefox) before it worked correctly.

- Settings > Accounts and Import 
- Find the account in question (e.g. myemail@example.com <-- substitute your email here)
- Click "edit info"
- Enter your name and choose your alias setting (or leave it as-is this step doesn't really matter)
- Click "Next Step"
MOST IMPORTANT: Change your SMTP Server setting
-- I previously had mine set to mail.example.com (where "example.com" was my custom domain). Your setting might be different, but what's important is what comes next. 
-- You'll need the domain of your host (dreamhost.com, hover.com, etc.)
-- Add "smtp." before the domain of your host
-- smtp.domainofyourhost.com (where "domainofyourhost.com" is the domain of the company that hosts your email).
- Port: 587
- Username: myemail@example.com (substitute your email here)
- Password: [the password your hosting company gives you for your email. It's probably different than your gmail password or from the password you use to log into your hosting company. If it's not different, it should be and you should go change your passwords now. ;) ]
- Click "Secured connection using TLS"
- Click Save Changes
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Same problem here in Brazil, i Google going to do something about it?
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Same problem. I´m from Chile and since this morning I can't send mail from my second mail account. If any one has the solution, please share it with us.
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Same issue here.  There is no consistency with how they are being rejected.  I have two different "Send Mail As" accounts setup, and both are being rejected from time to time.  Very frustrating for a small business owner.
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Mesmo problema!
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Same problem since this afternoon, here in Argentina, very frustrating, please, google check this out urgently, many thanks regards.
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Same problem!!! Fucking annoying
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Same here, please @Google fix this asap!
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SOLUTION:

As of April 2020, Google started enforcing TLS when sending email. 


In the Gmail settings under Accounts and Imports, Edit your Send mail as Email settings.
Change your outgoing servername (SMTP Server) to smtp.hostprovider.com (mine was smtp.dreamhost.com). If you are using your website name, (mail.example.com), this will continue to fail.
I also updated the port number from 587 to Port 465

Hope this helps.
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If trying @Dimitry Berg solution ... does anyone know what network solutions default SMTP would be?
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I am having the same problem too on 4/9/20